Re: [w3c/ServiceWorker] consider allowing multiple worker thread instances for a single registration (#756)

Thank you for your very detailed analysis @wanderview!

There are two main points from your summary that I'd like to pull out as arguments _for_ allowing multiple service worker instances:

> thread pool does help with the "blocking worker" case

...and...

>  it does seem desirable to allow service worker thread instances to run co-located in the same process as the controlled window

I think the real key here is to **remove the restriction of only allowing one service worker instance that handles all events**. By removing this restriction we should be able to optimize for the two scenarios above as well as allowing push and background sync events that can be handled in a timely and concurrent fashion in the background.

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